package com.google.code.contactserv.func.execution;

import org.apache.commons.cli.CommandLine;

import java.lang.reflect.Method;

/**
 * Copyright 2007 The semap project development team.
 * <p/>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * <p/>
 * Created by ${user} at ${date} ${time}.
 * <p/>
 * ${description}.
 * <p/>
 * $Id$
 */
public class ClassExecutorFactory extends ExecutorFactory{

    protected Executor getInstanceInt(CommandLine line) {
        if(!line.hasOption('c'))
          throw new IllegalArgumentException("Class name not specified");

        ClassExecutor executor;
        try {
            executor = new ClassExecutor();
            executor.setExecutionMethod(getMainMethod(line.getOptionValue('c')));
            System.setSecurityManager(new SystemExitSecurityManager());
        } catch(ClassNotFoundException e){
            throw new IllegalArgumentException("Class not found: " + line.getOptionValue('c'));
        } catch(NoSuchMethodException e){
            throw new IllegalArgumentException("No \"main(String[] args)\" method in class " + line.getOptionValue('c'));
        } catch(Exception e){
            throw new IllegalArgumentException(e);
        }
        return executor;
    }

    private Method getMainMethod(String name) throws ClassNotFoundException, NoSuchMethodException {
        Class c = this.getClass().getClassLoader().loadClass(name);
        Class partypes[] = new Class [1];
        partypes [0] = String[].class;
        Method m = c.getMethod("main", partypes);
        return m;
    }
}
